hxbuffer.h
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上传日期:2007-06-06
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- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- #ifndef _HXBUFFER_H_
- #define _HXBUFFER_H_
- #include "ihxpckts.h"
- #include "hxvalue.h"
- //#include "hxheap.h"
- #include "hxstring.h"
- // This determines the length of the built in buffer that is used if the
- // data length is small enough, to save us from allocating so many little
- // pieces of data.
- #define PnBufferShort
- #ifdef PnBufferShort
- const int MaxPnbufShortDataLen = 15;
- #endif
- #define NUM_ALLOCATION_EACH_TIME 25
- /****************************************************************************
- *
- * Class:
- *
- * CHXBuffer
- *
- * Purpose:
- *
- * PN implementation of a basic buffer.
- *
- */
- class CHXBuffer
- : public IHXBuffer
- {
- protected:
- LONG32 m_lRefCount;
- ULONG32 m_ulAllocLength;
- BOOL m_bJustPointToExistingData;
- #if !defined(HELIX_CONFIG_NOSTATICS)
- // Interface for optional allocator
- static IMalloc* m_zMallocInterface;
- #endif
- // number of CHXBuffer allocated at a time to be placed in freeStore
- static CHXBuffer* s_pFreeStore;
- static const int s_iBufferChunk;
- virtual ~CHXBuffer();
- BOOL FreeWithMallocInterface() const;
- #ifdef PnBufferShort
- // buffer for small amounts of data
- //UCHAR m_ShortData[MaxPnbufShortDataLen + 1];
- #endif
- enum { BigDataTag = 0xEE };
-
- union
- {
- struct
- {
- UCHAR* m_pData;
- ULONG32 m_ulLength;
- unsigned char m_FreeWithMallocInterfaceIfAvail;
- } m_BigData;
- UCHAR m_ShortData[MaxPnbufShortDataLen + 1];
- };
- bool IsShort() const;
- HX_RESULT SetSize(ULONG32 ulLength, BOOL copyExistingData);
-
- UCHAR* Allocate(UINT32 size) const;
- UCHAR* Reallocate(UCHAR*, UINT32 oldSize, UINT32 newSize) const;
- void Deallocate(UCHAR*) const;
- PRIVATE_DESTRUCTORS_ARE_NOT_A_CRIME
- public:
- CHXBuffer();
- CHXBuffer(UCHAR* pData, UINT32 ulLength, BOOL bOwnBuffer = TRUE);
- #if 0
- #ifndef __MWERKS__
- #if defined (_DEBUG) && defined (_WIN32) && 0
- void * operator new(
- unsigned int,
- int,
- const char *,
- int
- );
- #else
- void * operator new (size_t size);
- #endif /*defined (_DEBUG) && defined (_WIN32) */
- void operator delete(void *p, size_t size);
- #endif /*__MWERKS__*/
- #endif /*0*/
- inline CHXBuffer& operator=(const char* psz);
- inline CHXBuffer& operator=(const unsigned char* psz);
- inline CHXBuffer& operator=(const CHXString &str);
- /*
- * IUnknown methods
- */
- STDMETHOD(QueryInterface) (THIS_
- REFIID riid,
- void** ppvObj);
- STDMETHOD_(ULONG32,AddRef) (THIS);
- STDMETHOD_(ULONG32,Release) (THIS);
- /*
- * IHXBuffer methods
- */
- STDMETHOD(Get) (THIS_
- REF(UCHAR*) pData,
- REF(ULONG32) ulLength);
- STDMETHOD(Set) (THIS_
- const UCHAR* pData,
- ULONG32 ulLength);
- STDMETHOD(SetSize) (THIS_
- ULONG32 ulLength);
- STDMETHOD_(ULONG32,GetSize) (THIS);
- STDMETHOD_(UCHAR*,GetBuffer)
- (THIS);
- public:
- static HX_RESULT FromCharArray
- (
- const char* szIn,
- IHXBuffer** ppbufOut
- );
- static HX_RESULT FromCharArray
- (
- const char* szIn,
- UINT32 ulLength,
- IHXBuffer** ppbufOut
- );
- static void SetAllocator(IMalloc* pMalloc);
- static void ReleaseAllocator();
- };
- CHXBuffer& CHXBuffer::operator=(const char* psz)
- {
- Set((const unsigned char*)psz, strlen(psz)+1);
- return(*this);
- }
- CHXBuffer& CHXBuffer::operator=(const unsigned char* psz)
- {
- Set(psz, strlen((const char*)psz)+1);
- return(*this);
- }
- CHXBuffer& CHXBuffer::operator=(const CHXString& str)
- {
- Set((const unsigned char*)(const char *)str, str.GetLength()+1);
- return(*this);
- }
- // This class was created in order to be able to have a buffer that consists of
- // a subset of another existing buffer without allocating any new data or
- // copying data over. The way to use this class is to instantiate it with 3
- // parameters:
- // 1) A pointer to the superset buffer,
- // 2) The pointer to the point in the the buffer that represents the start of
- // the subset buffer, and
- // 3) The length of the subset buffer.
- //
- class CHXBufferFragment : public CHXBuffer
- {
- public :
- CHXBufferFragment(IHXBuffer * pWrappedBuffer, UCHAR* pModFrameStart, ULONG32 ulFragLen) : CHXBuffer( pModFrameStart, ulFragLen, FALSE ), m_pHXBufferPointedTo(pWrappedBuffer){ if(pWrappedBuffer) {pWrappedBuffer->AddRef();} };
- ~CHXBufferFragment(){ HX_RELEASE(m_pHXBufferPointedTo);}
- protected :
- IHXBuffer * m_pHXBufferPointedTo;
- };
- #endif